| A. About Optolong's O-III (6.5nm) FIlter The Optolong O-III (Oxygen-III) extra-narrowband filter is designed to improve the visibility of various deep sky objects. It does this by:
This is a blue-green colored filter as OIII emits 495.9nm and 500.7nm. Many images of planetary nebulae and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image. B. Main Uses and Performance
C. Spectral Curve Transmission Characteristics
D. Technical Specifications
E. Optical Coating Specifications
WARNING: Optolong filters are not designed for direct solar observation. NEVER use these filters for observing the Sun, or permanent eye and equipment damage will result. Additional InformationAbout Optolong While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters. |













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